Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86ae39d619ee4f0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-11 23:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 136adf4be0b93eafc659cf3918049beb SHA-1: 9392827ca7834c08ba774b96c8caa50a8956283f SHA-256: c86ae39d619ee4f0562616fbad3b3c3c645896e2c8aeb06bf37b80871430e196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to potentially compromised websites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=app+detect+mock+location PDF link annotation
    • http://reutlinger.pl/userfiles/file/72037078238.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/80074926922.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/situjijuwilu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/rujewufukixejunufap.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210906192411.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/kadikezepawodoxazu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bizazu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b457acb46e---30131421228.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/pebinomutuz.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/perasukodamadadoz.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/noroxafe.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/46603283835.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/60330b06c9e093bf5c49d3f7081612a6/45871294361.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/gopemopamulunumudapamu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1f3d06e8289613c5a3d8cca654701812/fuzunebumozuse.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109042250245695.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cd067ffb543ec35957828ec68def0d4a/xopuposamikarore.pdfIn PDF document text
    • http://pactolous.hu/upload/file/65616077875.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136745a47217---jovojexalurabiguvu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cd3330621e1808a8f85ca897c5318f11/22262162502.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/rarefugajivuvoredoto.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/43380297321.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/22332896734.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 15248 bytes
SHA-256: f4317695c61ede514e0ffdaedd17656f8a46d638f5a0e1674c6a2456d69dec64
font_02_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10480 bytes
SHA-256: 3d896b3eb3e44b276e21c6391af9d4edb65ac4dc07581990418247c9946ab730

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